We have a 454 with some casting marks were not sure of, would anyone know them?
#361959
HI PER , P SS , F9
GM10 1 , COVN1 , A21 77
Thanks for the help.

I don't know about the rest but that cast # was used for engines from 73-85 and more that likely used in a Chevelle if it is hi perf from 73 -75.At least that is what the book says.

1977 454 pickup truck,or motorhome engine.Not a bad core.If you have the heads,they may be large ovals.That would be a good combo for up to 550 hp without a lot of effort.I wouldnt worry about 2 or 4 bolt main or steel crank.A 2 bolt/cast crank will handle 550 hp with no problem.Good luck.